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Title: Aerodynamics and CFD analysis of equal size dual-rotor wind turbine

Abstract

The linear momentum theory is used to analyze the power-extraction capability of dual-rotor wind turbines with equal-size rotors. The rotors of a dual-rotor wind turbine are modeled as two separate actuator disks. The stream tube encompassing the front rotor is modeled as two (inner and outer) stream tubes, with the rear rotor being fully enclosed within the front rotor inner stream tube. No assumption is made on airflow pressure in between the rotors. The effect of the front and rear rotor interaction on the airflow within the inner stream tube is included in the analysis. With the results obtained, axial thrusts on front and rear rotors are determined and later used as input for computational fluid dynamics simulation to determine flow characteristics across the rotors. Based on the flow pattern between the rotors, the total power coefficient of a dual-rotor wind turbine is related to the rotor separation distance. A general solution for the dual-rotor wind turbine is developed, which shows that the largest total power coefficient that can be obtained is 0.814, occurring at a rotor separation distance of 2.8 times the rotor diameter. The results of this study are compared with those obtained by similar studies reported inmore » the literature. Discrepancies in the largest possible power coefficient of dual-rotor wind turbines reported in various investigations are examined and discussed.« less

Authors:
 [1];  [2];  [1];  [1]
  1. National Wind Energy Center, University of Houston, Houston, Texas 77204, USA; Department of Mechanical Engineering, University of Houston, Houston, Texas 77204, USA
  2. National Wind Energy Center, University of Houston, Houston, Texas 77204, USA
Publication Date:
Research Org.:
Univ. of Houston, TX (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1535340
Grant/Contract Number:  
EE0000295
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Renewable and Sustainable Energy
Additional Journal Information:
Journal Volume: 9; Journal Issue: 4; Journal ID: ISSN 1941-7012
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
Science & Technology - Other Topics; Energy & Fuels

Citation Formats

Sundararaju, Haripriya, Lo, King H., Metcalfe, Ralph, and Wang, Su Su. Aerodynamics and CFD analysis of equal size dual-rotor wind turbine. United States: N. p., 2017. Web. doi:10.1063/1.4999500.
Sundararaju, Haripriya, Lo, King H., Metcalfe, Ralph, & Wang, Su Su. Aerodynamics and CFD analysis of equal size dual-rotor wind turbine. United States. doi:10.1063/1.4999500.
Sundararaju, Haripriya, Lo, King H., Metcalfe, Ralph, and Wang, Su Su. Sat . "Aerodynamics and CFD analysis of equal size dual-rotor wind turbine". United States. doi:10.1063/1.4999500. https://www.osti.gov/servlets/purl/1535340.
@article{osti_1535340,
title = {Aerodynamics and CFD analysis of equal size dual-rotor wind turbine},
author = {Sundararaju, Haripriya and Lo, King H. and Metcalfe, Ralph and Wang, Su Su},
abstractNote = {The linear momentum theory is used to analyze the power-extraction capability of dual-rotor wind turbines with equal-size rotors. The rotors of a dual-rotor wind turbine are modeled as two separate actuator disks. The stream tube encompassing the front rotor is modeled as two (inner and outer) stream tubes, with the rear rotor being fully enclosed within the front rotor inner stream tube. No assumption is made on airflow pressure in between the rotors. The effect of the front and rear rotor interaction on the airflow within the inner stream tube is included in the analysis. With the results obtained, axial thrusts on front and rear rotors are determined and later used as input for computational fluid dynamics simulation to determine flow characteristics across the rotors. Based on the flow pattern between the rotors, the total power coefficient of a dual-rotor wind turbine is related to the rotor separation distance. A general solution for the dual-rotor wind turbine is developed, which shows that the largest total power coefficient that can be obtained is 0.814, occurring at a rotor separation distance of 2.8 times the rotor diameter. The results of this study are compared with those obtained by similar studies reported in the literature. Discrepancies in the largest possible power coefficient of dual-rotor wind turbines reported in various investigations are examined and discussed.},
doi = {10.1063/1.4999500},
journal = {Journal of Renewable and Sustainable Energy},
number = 4,
volume = 9,
place = {United States},
year = {2017},
month = {7}
}

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Works referenced in this record:

Review of computational fluid dynamics for wind turbine wake aerodynamics
journal, February 2011

  • Sanderse, B.; Pijl, S. P.; Koren, B.
  • Wind Energy, Vol. 14, Issue 7, p. 799-819
  • DOI: 10.1002/we.458